Wednesday, February 18, 2009

1800 miles to go...

according to the TV screen (which, if updated, gives our waypoints
and ETA) until we return to dry land. We're following a "great
circle" (extra credit?) back to P.A and the straits of Magellan. At
about 10 knots, we should be in sometime on the 26th. A little ahead
of schedule, but there's a lot of ocean and potential weather delays
until we get there. As of right now, it's smooth sailing though.

I'll probably write some reflections on the trip over the next week
or so, as I work on putting some of the data together for the final
cruise report. But if anyone has suggestions, or questions that have
have been left unasked, let me know (write a comment!).

I'm trying to switch back to a more traditional schedule, so I've got
to get to bed now -- before I get hungry, since I skipped midrats.
The rocking motion seems to help...

1 comment:

  1. From the Kage-gumi (Shadow Friends) to Chris-

    We had a lunch meeting where Mrs. Haste pulled out the water samples and T-S data from her cruise on the California Current with members of MBARI for us to compare to your PIG data set. Here’s what we saw:

    The California current Data is from Station 60-90 at 36.34 N/125.44 W and station 67-90 at 35.46 N/124.9 W. In this we saw that from 0-1500 meters there was a gradual decrease in salinity followed by a fairly consistent measurement from 1500->4000 meters that varied only in hundredths. The temperature decreased was radical from 14-15 degrees Celsius at the surface to a marginal difference after 3000 meters where it hovered at 1.4 – 1.5 degrees Celsius. We had the CTD operator data sheets as well as the graph to use to see the patterns. We even were able to touch water Mrs. Haste collected in sample bottles from the rosette at different levels.

    The Antarctica data suggests a more gradual drop in temperature, although it starts at a considerably lower temperature at the surface than the California data. In the PIG data there is a level area between the surface and ~25 meters where the sub zero temperature is steady then the drop is punctuated by places where the temperature levels out as it gets deeper. The overall angle of change is shallower than the California Current data, they seem inverse with the PIG being a bit more compressed in shape.

    The salinity data is confusing to us. We didn’t really have the experience to immediately understand the leveling and great difference in salinity near the surface. We’ll have to do some experiments with freezing salt water to get a better understanding so that the data will reflect our understanding of the freezing of water out of the ocean into sea ice and how that combined with freshening at the glacial margin changes the water chemistry. We’ll have to explore some activities we were given by ANDRILL. We were really confused by the shelf data and will meet again to look at it after we have tried the activities.

    We have scans of the California Current data to share and photos of our meeting if you would like them.

    Thanks for sharing with us!